Tongs



M. GLAS Oct. 25, 1938.

TONGS Filed April 1-1, 1936 7 Sheets-Sheet 1 5 B 5 m n 5 v v N N m 0 T 4 7 NU m IR A i Q w I w M u V! B Oct 25, 1938. M. GLAS 2,133,984

TONGS Filed April 11, 1936 7 Sheets-Sheet 2 1,82 ,2; 1 9i L 1 2L INVENTOR- MAURUS GLA ATTORNEYS Oct. 25, 1938. M. GLAS 2,133,984

TONGS Filed April 11, 1936 7 Sheets-Sheet 3 193i file-Qi- INVENTOR= E @MAURUS GLA6 BY 9L ATTORNEYS s Oct. 25, 1938. GLAS 2,133,984-

I TONGS Filed April 11, 1936 7 Sheets-Sheet 4 I hi.

\I INVENTORI 'MAURUS GLAS s flamw z AJTTORNEVS M. GLAS Oct. 25, 1938.

TONG'S 7 Sheets-Shet 5 Filed April 11, 1936 $3 WL v Namw 5 R V m M M .U A M/ V. B

- Oct. 25, 1938. M. GLAS 2,133,984

TONGS Filed April 11, 1956 7 Sheets-Sheet 6 HMIIUIIM mmmmu v nmmiim N- IIIIIHQIIII lNVEl NTOR MAURUS GLAS- Wd ZQ Z- ATTO RN 5V5 Patented a. 25, 1938 UNITED STATES TONGS Maurus Glas, Schmalkaldcn-Naherstille, Germany, assignor oi. one-half to the firm Gebriider Heller, Schmalkalderi, Thuringia, Germany Application April 11, 1936, Serial No. 73,879

24 Claims.

This invention relates to tongs having a bowshaped working head wherein the tool is rectilinearly guided. Devices of this kind are for instance supplied with metal architectural boxesv containing fiat, angular and profiled material of different sizes, which can be made into models and toys. If made in larger sizes, these combination tongs are used in industry and by various If the work'concerned does not involve large forces and parts of small dimensions are to be handled, the tongs are so constructed that both sides thereof can be compressed by one hand.

beam of larger parts where greater forces occur, the tongs can be constructed so that two side pieces foroperation by each-hand are provided, or the tongs may be inserted in a frame and actuated by treadle, motor, belt drive, etc.

By way of example, one form of the invention is illustrated in the accompanying drawings, in

' so which Figure 1 is a side view of a working head connected with its carrier by being placed on a cylindrical projection thereof and secured by a cotter D Fig. 2, a view of a working head, partly in section;

Fig. 3, a section on the line 3-3, of Fig. 1; Fig. 4, a section on the line 44, of Fig. 1; Fig. 5, a view of a horseshoe-shaped cotter pin by means of which the working head is connected with its carrier;

Fig. 6, a side view of this cotter pin; Fig. 7, an elevation of a working head surrounding its carrier like a. fork and connected therewith by a conical pin; Fig. 8, a section on the line 8-8, of Fig. 7; Fig. 9, a view of the working head, partly in section, without jts carrier;

Figs. 10 and 11, and 12 to 22 show tools for the tongs, Fig. 10 showing a sleeve which surrounds the tool;

Fig. 11 being a top view of this sleeve; Fig. 110, another view of the tongs with a slightly modified sleeve; 56 Figs. 11b and lie being, respectively, an elevation and a side view of a side of the tongs as constructed when-the sleeve is formed like Fig.

Fig. 12 being a view of another slightly modified sleeve; I J 5 Fig. 13, a top view of this sleeve;

Fig. 14ran elevation of ariveting set;

. 15, a side view of this riveting set;

. 16, a top view of this riveting set;

. 17, an elevation of a punch;

. 18, a side view of this punch;

. 19, a bending tool;

. 20, a top view of this tool; v t

21, a view of a slightly modified riveting 15 set;

22, a view of a' slightly modified punch; 7

Figs. 23 and 24 are two diiferent forms of a complete pair of tongs. for operation by one hand;

Figure 23a is a transverse section of the upper portion of the tongs on line Zia-23a of Figure 23; Figure 24a is a transverse section of Figure 24 taken on line flit-44a.

Figs. 25 and 26'are sections on the line 25-25, of Fig.- 24, showing different constructional forms;

Figs. 27 to 36 show different forms of the working head;

Fig. 37 is a view of tongs constructed'with large sides for applying greater forces; 30

Fig. 38, a side view of these tongs;

Fig. 39, a diagrammatic view of a pair of tongs for treadle drive;

Fig. 40, a diagrammatic view of a pair of tongs for motor drive;

Figs. 41 to 45 show parts of a modified form of tongs according to Figs. 37 to 38,,wherein a distance piece is provided,

Fig. 41 being a view with the distance piece erected;

Fig. 42, a plan of Fig. 41;

Fig. 43 showing the distance piece pushed over the straps;

Fig. 44 being a plan of Fig. 43; and

Fig. 45, a diagram of the distance piece.

Referring to the drawings, I is the working head having a horn lb, which is exchangeably secured to the pin 2 of its carrier, e. g., the fixed side portion 3, by means of a cotter pin 4. Parallel with the fastening bore 5 on the working 50 head i extends a second bore 5 for guiding the intermediate sleeve 1 whichis provided in front with the slot 8 and in the rear with a collar 9 possessing a longitudinal slot Ill. The lower plane side of the collar 9 is constructed so as to u formthe spring plate II. The bore of the intermediate sleeve I serves for guiding the actual working member or stamp 10, 1b for, respectively, punching and riveting, which rearwardly extends into a thread I3 for the reception of the head l3a. The thread ii of the working member Ic, It; extends through the head l3a and the farther projecting portion of the member Ic, Ib forms asquare piece lib to permit'radial motion, for instance by means of a key. When used as a riveting stamp a cross pin I9 passes at a certain distance from one end of the tool. The end 8' of the longitudinal slot 8 of the intermediate sleeve I is somewhat enlarged to permit locking of the working member Ic, ID with the sleeve I by giving the former a slight turn. The stamp head I3a possesses two small projections I4 for engaging the slotted ,end lid of the lever moving the tool, such as the movable side l5 of the tongs, as indicated in Fig. 23. The head Ila serves for guiding the tool at the front face I6 of the portion carrying the working head, e. g., the fixed side portion 3, and this guide is interrupted by the transverse slot It.

To exchange tools for different operations it is only necessary to slightly knock the cotter pin 4 whereupon the working head i can be removed. After removal of the working head I from the pin the movable tooI'is fully exposed and need only be lifted out of the transverse slot Iia. A new tool is then put on in reversed order.

For punching, the intermediate sleeve I serves as a rigid or movable stripper, it being rigid, if the collar 9, by a slight turn, is locked with the cross slot II of the longitudinal guide I6, and movable, if the longitudinal groove III of the sleeve I can slide in the longitudinal guide It. According to Fig. 11a, to permit locking of the intermediate sleeve la in different positions with the longitudinal guide I6, the collar 9 of the sleeve, apart from the groove I0, may be provided all around with a thread fillet which can engage a thread sector 9" arranged on the longitudinal guide l6 of the side member I carrying the working head I, as shown in Figs. 11b and lie, or of the intermediate member BI.

For riveting, the intermediate sleeve I serves for compressing the layers of material .to be riveted during the pressing of the rivet head when the longitudinal slot of the sleeve can freely move upon the longitudinal guide 16. The sleeve I serves as rivet setter if the cross pin I. at the bottom of the slot 8 of the intermediate sleeve I is locked with the transverse slot 8' by a slight turning motion. Furthermore, the cross pin is also serves for positively withdrawing thesrlvet setter by hugging the bottom of the slot 8 so as to have free play only towards the front. The head of the rivet stamp 'Ib recedes relative to the foremost surface of the intermediate sleeve I at the initial position of the tongs to the extent of the length of the rivet. As the layers of material to be riveted vary in number and thickness and the path of the intermediate sleeve differs from that of the riveting set, the drive of the sleeve 1 by the latter must not be rigid. For this reason, a spring I8 is interposed between the head I to and the intermediate sleeve I for compensating in each instance the varying thicknesses and numbers of the layers of material during the pressing of the head and also for insuring sui'ilcient pressing of the materials to be riveted.

For shaping, the movable tool must be made stronger by eliminating the intermediate sleeveand imparting to the tool the outer diameter of the sleeve. The stronger working stamp 24 is fitted in the rear with a cross pin 24a for axial driving. The moving stamp 24 is guided in radial direction by the collar 242) which in this case is somewhat broader than the transverse groove ll of the longitudinal guide I6 and which possesses a groove c.

Another form of construction of the working head and tools is. shown in Figs. '7, 8, 9, 12, 13,20 and 21, wherein the lower portion Ia of the working head I is slotted whilst the part connected therewith, such as the side member 3', is not slotted, both portions being connected by a wedge 50 which can be easily knocked out of the bore 50'- for exchanging the head i.

The intermediate sleeve 1', instead of being provided witha collar 8 having a groove III, can

be fitted with a collar 5i flattened at its two parallel sides Ma. The non-flattened edges of the collar are fluted or otherwise roughened to facilitate the turning of the collar and of the intermediate sleeve I by hand. It is therefore not necessary to provide the riveting set Ib and the punch 10 with a. square head, so that they can be constructed as shown in Figs. 20 and 21 and no key is required any more for moving the intermediate sleeve.

To apply as much force as possible by means of ,the tongs a toggle lever transmission may be provided. In this construction, the side member I! acts on the pins it of the stamp head Ila not directly but through the medium of an intermediate lever- 52 and a toggle lever 53, the side member l5 being rotatable about the point '4 and. in so far as it is intended to embrace the side member 8, of. fgrk-like construction. To the pin either the fork-like toggle lever 58 which embraces the side member I is articulated, or a single lever 53' is hinged to each side of the member 8. The levers l5 and 53 or 53' are connected with the second lever 52 so as to be rotatable 'about the pins: 58 or 51. The toggle lever 53 or the two single levers 5! replacing it a slot' bl wherein the two ends I4 are guided. The stroke of the member ID and I0 is limited by a set screw 58 passing through the lever 62 and seated on the surface 80 of the member I during compression oi the side members 3 and II.

- To insure convenient operation of the tongs and easy'access to the jobs to be worked the construction is such that the fixed shank of the. tongs is so far distant from the extended axis of the tool that the back of the hand lies behind this axis and the entire motionof the shank and hand takes'place between this axis and the plane passing thereon verticallythrough the horn end of the working head.

The .exchangeability of tli'e working head affords the advantage of employing different forms of the head according to the nature of the work. Figs. 27 to 36 diagrammatically show such forms, these according to Figs. 33 to 35. serving particularly for producing profiles.

The other figures show tongs of a type required for treating larger work pieces and applying greater forces. The portion carrying the means for transmitting motion is not the shank of the tongs but an intermediate member 6| exchangeably connected with the working head I as well as with the means on which the force acts. To

provide better possibilities for directing the.

action of the tongs on the work theaxis oi the tool Ib, Tc, 2 is arranged at an angle to the axis .1 in the direction of whichthe force is transmitted bythe means on which it acts to the motion transmitting means carried by the intermediate member 6I which is exchangeably .connected either with a shank set or with a frame.

The shank set, Figs. 3'7 to 38, comprises a yoke 62 on both sides of which the shanks or side members 63, 64 are arranged which, by means of the levers 65, 66, are connected with a draw bar 61 symmetrically disposed between them for ac tuating the tool. In the perforated center 68 of the yoke 62 through which passes the connecting rod 61 interchangeably united by means of a screw 10. or other suitable means with the elbow lever 69 hinged to the intermediate plate 6| a rotatable fork 13 carrying the intermediate plate 6| is concentrically arranged with a cylindrical projection 1| with the connecting rod 61 and can be fixed in position by means of a thumb screw 12 vided with the straps 94, 95 to which the levers are hinged. The connecting rod 61 isguided in a slot 11 of the intermediate plate 6| by means of a guide 18. The arrangement. of the sleeve 14 further serves for compensating the rotation of the connecting rod 61 relative to the shank set due to the rotation of the working head I with the intermediate plate 6| relative to the shank set. To effect or assist in the, automatic spreading. of the side members 63, 64 a helical spring 19 is preferably disposed in the slot 11 of the intermediate plate 6|, which is supported by the shank set and the guide 18 of the connecting rod 61 and tends to press these two parts apart.

The sides of the tongs can be more easifyoperated in certain circumstances if their angle of expansion is quite large. To attain a large angle when material. of slight thickness is worked and the angle is naturally small the sleeve -14 is connected with the rod 61 so as to be displaceable in the longitudinal direction thereof. For this purpose the connecting rod 61 is fitted atgits end with a thread 16 over which the sleeve 14 can travel and be held at either end by screws 15.. To obviate the necessity of adjusting the screws 15 in each instance, the construction may be modified accordingly. For example, if only material in thin layers is worked, so that a large space exists between the tool and the horn lb when the sides of the tongs are spread and'the latter would have to be compressed to a considerable extent without special expenditure of force to bring the tool into touchwith the material, a special element 98 can be provided to bring the tool closer to the mate rial without requiring at first any compression of the sides of the tongs.

In this'manner a separation is effected between feeding work and actual application of force or, stated more accurately, between the work during which the tool is chiefly moved forward 'at little expenditure of force and the work at which the tool is moved forward only slightly but the main component of force has to be applied. For the actual application of the main force a large path of the shanks is thus available, so that it becomes possible to work with a large ratio of transmission due to the hinging of the levers 65, 66 to the sides 63, 64 near the yoke 62 at IN and I02, whereas in the tongs according to Figs. 3'1 and 38, which do not possess the element 98, the corresponding points I03, I04 are farther away from the yoke 62. Between the sleeve 14' and the screws 15 on the thread 16 a distance piece is arranged comprising a centrally perforated milled disc 98 and two bars 99 vertically arranged on the disc 98 and forming parts of a cylinder, so that at a corresponding rotation of the milled. disc 98 they can either embrace the straps 94 and 95 of the sleeve 14' on both sides or be seated thereon. In the latter case, the distance of the nuts 15 positioned on the ,thread 16 of the connecting rod 61 from the straps 94, 95 is increased, i. e., the connecting'rod 61 is drawn down and the tool brought more closely to-the horn lb, without any compression of the sides 63, 64. During compression of the latter the force acts first through the intermediate levers 65, 66 upon the straps 94, 95 and then uponthe bars 99 and the milled disc 98 which in turn transmits the force to the nuts 15, whereby the connecting rod 61 is drawn down. When the sides 63, 64 expand,

- the connecting rod'61 is drawn back again by the spring 19. To prevent self-rotation of the milled disc 98 and of the bars 99 a compression spring I00 can be slipped over the connecting rod61 between thestraps 94,95 and the disc 98, whose compressive force must of course be'smaller than that of the spring 19.

' The distance piece may further be constructed so that-the bars 99 have pairs of steps 96, 91 for adjusting different distances by a corresponding rotation.

According to Fig. 41, the sleeve 14' is so constructed that it guides the connecting rod 61 and ,is itself guided in the cylindrical projection 1|.

In this way; symmetrical motion of the sides is insured and the connecting rod 61 is not subjected to'bending stresses even during unsymmetrical motion of the sides. 5

The driving frame for foot or motor operation,.which may replace the shank set described, comprises a low trestle, as shown in Fig. 39, in which a draw bar 8| is arranged in an obliquely upwardly extending rail 82 which may be replaced by some other suitable member. To the upper end of the rail 82 a holder 82' is secured to which, in the same manner as the yoke 62 the fork 13 carrying the intermediate plate 6| is detachably and pivotally connected, said fork being adapted to be fixed in position by means of the toggle 83 or other suitable means. The draw bar 8| is also interchangeably connected with the elbow lever 69. In case of drive by a motor the spring 19 can be dispensed with. The low construction of -.the driving frame and its provision with the obliquely upwardly extending guide 82 for the draw bar 8| serves, above all, for keeping the space surrounding the head of the tongs free from all parts that could be in the way when large and bulky work is to be handled. For example, the trestle together with the guide may be formed of the braces held together by a ground plate 88 and a 'cross brace 89.

For treadle drive the structure according to Fig. 39 is provided with two toggle lever transmissions 83, 84, 85, 86, the lever 86 being disposed in a carrier and formed as treadle with a foot plate 81. "The, lever 86 is actuated bya spring 88, and the lever 83 is connected with the draw bar 8|. In case of motor drive the levers 83, 84

r can be driven by a crank 9| which is driven by said sleeve, a carrier for the working head detachably connected, with said working head, a longitudinal guide in the carrier cooperating with said collar or said intermediate sleeve, and means for driving said tool.

2. A tong comprising a bow-shaped working head, a guide in one shank of the working head, a tool rectilinearly displaceable in said guide, this tool consisting oi? an intermediate sleeve having a collar at its lower end and of a stamp guided in said sleeve, a carrier for the working headdetachably connected with said working head, a longitudinal guide in the carrier cooperating with said collar, a cross grooved portion in said longitudinal guide, said collar being adapted to enter the cross groove in said grooved portion, and means for driving said tool.

3. A tong comprising a bow-shaped working head, a guide in one shank of the working head,

a tool rectilinearly displaceable in said guide,

this tool consisting of an intermediate sleeve having a collar. at its lower end and of a stamp guided in said sleeve, a carrier for the working,

head detachably connected with said working head, said collar having a groove, a longitudinal guide in the carrier cooperating with the groove in said collar of said intermediate sleeve, and

means for driving said tool.

4. A tong comprising a bow-shaped working head, a guide in one shank of the working head, a tool rectilinearly displaceable in said guide, this tool consisting of an intermediate sleeve having a collar at its lower end and of a stamp guided in said sleeve, said collar having guide means'on its sides, a carrier for the working head detachably connected with said working head, a longitudinal guide in the carrier adapted to I cooperate with the guide means on the sides'of said collar of said intermediate sleeve, and means for driving said tool.

5. A tong comprising a bow-shaped working head, a guide in one shank of the working head, a tool rectilinearly displaceable in saidguide, this tool consisting of an intermediate sleeve having a circumferentially threadened collar at its lower end and of a stamp guided in said sleeve,

a carrier for the working head detachably connected with said working head, a longitudinal threaded guide in the carrier adapted to cooperate with said threadened collar of said intermediate sleeve, and meansfor driving the tool.

6. A. tong comprising a bow-shaped working head, a guide in one shank of the working head, a tool rectilinearly displaceable in said guide, this tool consisting of an intermediate sleeve-which is slotted at its upper end and of a stamp guided in said sleeve, a driver for engaging the slotted end of said sleeve, a carrier for the working head detachably connected with said working head, and means for driving said tool.

7. A tong comprising a bow-shaped working head, a guide in one shank of the working head,

a tool rectilinearly displaceable in said guide,

ed in said sleeve, said stamp having at its lower end a head for driving and guiding it, a compression spring disposed between said collar and stamp head, a carrier for the working head detachably connected with said working head, and I means for driving said tool.

9. A tong comprising a bow-shaped working head, a guide in one shank of the working head, a tool rectilinearly displaceable in said guide, a carrier for the working head detachably connected-with said working head, the carrier being formed at its lower portion into a hand lever, and a second hand lever articulated in scissors fashion to the first mentioned hand lever, and means for connecting the free end of the second hand lever to said tool.

10. A tong comprising a bow-shaped working head, a guide in one shank of the working head, a tool rectilinearly displaceable in said guide, a carrier for the working head detachably connected with said working head, the carrier being formed at its lower portion into a hand lever, and a second hand lever articulated in scissors fashion to the first mentioned hand lever, and means for connecting the free end of the second hand lever to said tool, the two articulated hand levers being bent out of the axis of the tool to such an extent that during operation of the tool the back of the hand lies behind the plane directed through the axis of the i001 and perpendicularly to the plane of the two levers.

11. A tong comprising a bow-shaped working head, a guide in one shank of the working head,

,a tool rectilinearly displaceable in said guide,

a carrier for the working head detachably connected with said working head, and means for driving said tool, said means at least partly including articulated leversand of which one of said levers is constructed as a stroke limiting device for the tool and carries a set screw having the top thereof adapted to lie in close proximity to another of said levers.

12. A tong comprising a bow-shaped working head, a guide in one shank of the working head, a tool rectilinearly displaceable in said guide, a carrier for the working head detachably connected with said working head, and means for driving said tool, said means including members partly placed on said carrier and partly provided as a separate aggregate, and the carrier being formed asan intermediate piece detachably connected'with said aggregate.

13. A tong comprising a bow-shaped working head, a guide in one shank of the working head, a tool rectilinearly displaceable, in said guide, there being driving means and a driving member,

and an intermediate piece supporting the driving means for the tool and detachably connected both with the working head and with said driving member, said driving member comprising a connecting rod guided in the intermediate piece and detachably'connected with the driving means supported on the intermediate piece.

14. A tong comprising a bow-shaped working head, a guide in one shank of the working head, a tool rectilinearly displaceable in said guide, there being driving means and a driving member, and an intermediate piece supporting the driving means for the tool and detachably connected both with the working head and with said driving member, and said driving member comprising a connecting rod disposed at an angle to the axis of the tool.

15. A tong comprising a bow-shaped working head, a guide in one shank of the working head, a tool rectilinearly displaceable in' said guide,

there being driving means and a driving mechanism, an intermediate piece supporting the driving means for the tool and detachably connected both with the working head and with said driving mechanism,said intermediate piece having a cylindrical member arranged pivotally and fixably in a cylindrical bore of a member of said driv-' ing mechanism.

16. A tong comprising a bow-shaped working head, a 'guide in one shank of the working head, a tool rectilinearly displaceable in said guide,

-there being driving means, an intermediate piece supporting the driving means for the tool and detachably connected both with the working head and with a yoke, a cylindrical member upon said intermediate piece, movable hand levers articulated to said yoke, a connecting rod extending through a bore of said cylindrical member of the intermediate piece and being guided in the intermediate piece, means for transmitting the motion of said hand levers to said connecting rod, and means for transmitting the motion of said connecting rod to said tool.

17. A tong comprising a bow-shaped working head, a guide in one shank of the working head, a tool rectilinearly displaceable in said guide, there being driving means and a yoke, an intermediate piece supporting the driving means for the tool and detachably connected'both with the working head andwith said yoke, a cylindrical member upon said intermediate piece, movable hand levers articulated to said yoke, a connecting rod extending through a bore of said cylindrical member of the intermediate piece .and being guided in the intermediate piece, a sleeve on said connecting rod, means for transmitting the motion of said connecting rod to the tool, and'means for transmitting the motion of said hand levers to said connecting levers which at their ends pivotably engage with the hand levers and the sleeve arranged on the connecting rod.

18. A tong comprising a bow-shaped working head, a guide in one shank of the working head, a tool rectilinearly displaceable in said guide,

there being driving means and a yoke, an intermediate piece supporting the driving means for the tool and detachably connected both with the working head and with said yoke, movable hand levers articulated to said yoke, a cylindrical member upon said intermediate piece, a connecting rod extending through a bore of said cylindrical member of the intermediate piece and being guided in the intermediate piece, a sleeve on said connecting rod, means for transmitting the motion of said connecting rod to the tool, connecting levers engaging at their ends pivotally with the hand levers and said sleeve arranged on the connecting rod, and means for setting the sleeve on said rod at a predetermined distance from the end of said rod.

19. A tong comprising a bow-shaped working sleeve on the connecting rod, means for trans-' mitting the motion of said connecting rod to-the tool, connecting levers engaging at their ends pivotally with the hand levers and said sleeve on the connecting rod, and nuts for setting the sleeve on said rod at a predetermined distance from the end of the rod which is threaded within the limits of the movement of the sleeve. I

20. A tong comprising a bow-shaped working head, a guide in one shank of the working head, a tool rectilinearly displaceable in said guide, there being driving means for the tool and driving mechanism, an intermediate piece supporting the driving means for the tool, which intermediate piece is detachably connected with the working head and adapted to be connected for pivoting movement with the driving mechanism, said mechanism consisting of a machine frame to be placed on the floor, a connecting rod axially displaceable in the frame and in said intermediate piece and detachably connected to the driving means supported on the intermediate piece, and drive means for actuating said connecting'rod.

21. A tong comprising a bow-shaped working head, a guide in one shank of the working head,

- a tool rectilinearly displaceable in said guide,

there being driving means for the tool and a machine frame, an intermediate piece supporting the driving means for the tool, which intermediate piece is detachably connected with the working, head and adapted to be connected for pivoting movement with the machine frame which is intended to be placed on the floor, said frame having an obliquely and freely upwardly directed rod-like portion, a connecting rod axially displaceable in said oblique portion and in said intermediate piece and detachably connected to the driving means supported on the intermediate piece, a motor drive, and meansfor transmitting motion from said motor drive to the connecting rod.

922. A tong comprising a bow-shaped working head, a guide in one shank of the working head, a tool rectilinearly displaceable in said guide, there being driving means for the tool and a machine frame, an-intermediate piece supporting the driving means for the tool, which intermediate piece is detachably connected with the working head and adapted to be connected for pivoting movement with the machine frame which is intended to be placed on the floor, a connecting rod axially displaceable in the frame and in said intermediate piece and detachably connected to the driving means supported on the intermediate piece, a motor drive, and means for'transmitting motion from said drive to the connecting rod.

23. A tong comprising a bow-shaped working head, a guide in one shank of the working head, a tool rectilinearly displaceable in said guide, there being driving means for the tool and a machine frame, an intermediate piece supporting the driving means for the tool, which intermediate piece is detachably connected with the working head and adapted to be connected for pivoting movement with the machine frame which is intended to be placed on the floor, a connecting rod axially displaceable in the frame and in said intermediatepiece and detachably connected to the driving means supported on the intermediate piece, a motor drive, and means for transmitting motion from said drive to the connecting rod comprising an eccentric gear.

24. A tong comprising a bow-shaped working head, a guide in one shank of the working head, a tool rectilinearly displaceable in said guide, there being driving means for the tool and a machine frame, an intermediate piece supporting 5 the driving means for the tool, which intermediate piece is detachably connected with the working head and adapted to be connected for pivoting movement with said machine which is intended to be placed on the floor, a connecting rod axially displaceable in the frame and in said intermediate piece and detachably connected to 6 the driving means supported on the interme transmission gear. disposed between said eccen- 5 tric gear and the connecting rod.

MAURUB GLAS. 

